Maintenance along the bulk of the expressway from Llandygai, near Bangor to Broughton which began last April is also "on schedule" to finish by the end of the month with the work now being carried out overnight.

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Wide and abnormal loads are having to be escorted through the Conwy Tunnel when width restrictions are in place during "pre-advised" time slots to limit disruption.

The speed limit on the stretch of road remains reduced to 40mph, with average speed cameras in force.

The Welsh Government said in a statement yesterday: “All of our planned maintenance works between J11 (Llandygai) and the English border that previously caused disruption are now carried out overnight.

“As in the previous two years, this year we have focused our major works, such as Conwy Tunnel and Abergwyngregyn to Tai’r Meibion, on the winter months when traffic flows are lighter.

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“This year we have again seen that the delays have, in the main, been kept to acceptable levels.

“Once again this year we plan to complete our planned daytime works before Easter and have no further planned works until after the summer embargo.

“This is a major improvement in how we deliver works.”

Economy and Infrastructure Secretary Ken Skates said modernising the transport network across North Wales is a “key priority” for the Welsh Government.

He added: “The hundreds of millions of pounds I’ve committed to current and future road improvements, a third Menai crossing and the North East Wales Metro show how serious I am about delivering these improvements, which will benefit communities across North Wales.”